Work or effort primarily carried out using bodily strength, as opposed to [[脑力劳动|腦力勞動|nao3 li4 lao2 dong4]].

to personally experience and put into practice; to do as one preaches

The scientific study of forces acting on fluids (gases and liquids) at rest or in motion; covers fields such as hydrodynamics and aerodynamics.

The study of the motion of stars and other objects in space based on the laws of physics and gravity

aerodynamics; pneumatics

to practice what one preaches; to personally attend to something or carry it out with effort